{
  "outer_mm": [
    2337,
    500,
    400
  ],
  "gross_internal_l": 388.629696,
  "net_l": 350.02256163317924,
  "port_centerline_mm": 512,
  "port_area_cm2": 300,
  "helmholtz_hz": 19.7528,
  "max_excursion_500Wnom_mm": 8.055291481206778,
  "max_port_500Wnom_m_s": 16.74000462567361,
  "raw_f3_Hz": 25.68330037219046,
  "raw_f6_Hz": 19.280115399230944,
  "HP17_f3_Hz": 26.35393957006905,
  "HP17_f6_Hz": 20.431381694574497
}